arm64: add dump_user_range() to machine check safe

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GB28


CVE: NA

-------------------------------

In the dump_user_range() processing, the data of the user process is
dump to corefile, when hardware memory error is encountered during dump,
only the relevant processes are affected, so killing the user process and
isolate the user page with hardware memory errors is a more reasonable
choice than kernel panic.

The dump_user_range() typical usage scenarios is coredump. Coredump file
writing to fs is related to the specific implementation of fs's write_iter
operation. This patch only supports two typical fs write function
(_copy_from_iter/iov_iter_copy_from_user_atomic) which is used  by
ext4/tmpfs/pipefs.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>